“约见”面试官系列之常见面试题之第一百零三篇之vue-router实现路由懒加载（建议收藏）

vue异步组件es提案的import()webpack的require,ensure()

vue异步组件技术 ==== 异步加载

vue-router配置路由 , 使用vue的异步组件技术 , 可以实现按需加载 .

但是,这种情况下一个组件生成一个js文件

/* vue异步组件技术 */{path: '/home',name: 'home',component: resolve => require(['@/components/home'],resolve)},{path: '/index',name: 'Index',component: resolve => require(['@/components/index'],resolve)},{path: '/about',name: 'about',component: resolve => require(['@/components/about'],resolve)}

组件懒加载方案二 路由懒加载(使用import)

// 下面2行代码，没有指定webpackChunkName，每个组件打包成一个js文件。/* const Home = () => import('@/components/home')const Index = () => import('@/components/index')const About = () => import('@/components/about') */// 下面2行代码，指定了相同的webpackChunkName，会合并打包成一个js文件。 把组件按组分块const Home = () => import(/* webpackChunkName: 'ImportFuncDemo' */ '@/components/home')const Index = () => import(/* webpackChunkName: 'ImportFuncDemo' */ '@/components/index')const About = () => import(/* webpackChunkName: 'ImportFuncDemo' */ '@/components/about')

{path: '/about',component: About}, {path: '/index',component: Index}, {path: '/home',component: Home}

webpack提供的require.ensure()

vue-router配置路由，使用webpack的require.ensure技术，也可以实现按需加载。

这种情况下，多个路由指定相同的chunkName，会合并打包成一个js文件。

/* 组件懒加载方案三: webpack提供的require.ensure() */{path: '/home',name: 'home',component: r => require.ensure([], () => r(require('@/components/home')), 'demo')}, {path: '/index',name: 'Index',component: r => require.ensure([], () => r(require('@/components/index')), 'demo')}, {path: '/about',name: 'about',component: r => require.ensure([], () => r(require('@/components/about')), 'demo-01')}